Receiver selectance is the voltage response characteristic as a function of frequency around the principal response frequency of the receiver. It normally pertains to a linear receiver. For non-linear receivers such as those with clipping or AGC, selectance may be a function of signal level. Selectance of a receiver is measured in terms of voltage response as a function of the spectrum of frequencies, centered around the principal response frequency, which the receiver will amplify with significant gain. The methodology for this test describes three methods and requires only simple and commonly available test equipment. By definition, selectance is a measure of the falling off in the response of a resonant device with departure from resonance. It is expressed as the ratio of the amplitude of response at the resonance frequency to the response at some frequency differing from it by a specified amount.

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